public function testLoadPluginIfRegisteredAfterPluginBootEvent()
 {
     $emitter = new EventEmitter();
     $manager = new PluginManager($this->mockInjector, $emitter);
     $emitter->emit(Engine::ENGINE_BOOTUP_EVENT);
     $plugin = new BootCalledPlugin();
     $manager->registerPlugin($plugin);
     $this->assertTrue($plugin->wasCalled());
 }